+ for (i = 0; i < sk_X509_num(cpk->chain); i++)
+ {
+ x = sk_X509_value(cpk->chain, i);
+ if (!X509_STORE_add_cert(chain_store, x))
+ {
+ error = ERR_peek_last_error();
+ if (ERR_GET_LIB(error) != ERR_LIB_X509 ||
+ ERR_GET_REASON(error) != X509_R_CERT_ALREADY_IN_HASH_TABLE)
+ goto err;
+ ERR_clear_error();
+ }
+ }
+ /* Add EE cert too: it might be self signed */
+ if (!X509_STORE_add_cert(chain_store, cpk->x509))
+ {
+ error = ERR_peek_last_error();
+ if (ERR_GET_LIB(error) != ERR_LIB_X509 ||
+ ERR_GET_REASON(error) != X509_R_CERT_ALREADY_IN_HASH_TABLE)
+ goto err;
+ ERR_clear_error();
+ }
+ }
+ else
+ {
+ if (c->chain_store)
+ chain_store = c->chain_store;
+ else if (s)
+ chain_store = s->ctx->cert_store;
+ else
+ chain_store = ctx->cert_store;
+
+ if (flags & SSL_BUILD_CHAIN_FLAG_UNTRUSTED)
+ untrusted = cpk->chain;
+ }
+
+ if (!X509_STORE_CTX_init(&xs_ctx, chain_store, cpk->x509, untrusted))
+ {
+ SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, ERR_R_X509_LIB);
+ goto err;
+ }
+ /* Set suite B flags if needed */
+ X509_STORE_CTX_set_flags(&xs_ctx, c->cert_flags & SSL_CERT_FLAG_SUITEB_128_LOS);
+
+ i = X509_verify_cert(&xs_ctx);
+ if (i <= 0 && flags & SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR)
+ {
+ if (flags & SSL_BUILD_CHAIN_FLAG_CLEAR_ERROR)
+ ERR_clear_error();
+ i = 1;
+ rv = 2;
+ }
+ if (i > 0)
+ chain = X509_STORE_CTX_get1_chain(&xs_ctx);
+ if (i <= 0)
+ {
+ SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, SSL_R_CERTIFICATE_VERIFY_FAILED);
+ i = X509_STORE_CTX_get_error(&xs_ctx);
+ ERR_add_error_data(2, "Verify error:",
+ X509_verify_cert_error_string(i));
+
+ X509_STORE_CTX_cleanup(&xs_ctx);
+ goto err;
+ }
+ X509_STORE_CTX_cleanup(&xs_ctx);
+ /* Remove EE certificate from chain */
+ x = sk_X509_shift(chain);
+ X509_free(x);
+ if (flags & SSL_BUILD_CHAIN_FLAG_NO_ROOT)
+ {
+ if (sk_X509_num(chain) > 0)
+ {
+ /* See if last cert is self signed */
+ x = sk_X509_value(chain, sk_X509_num(chain) - 1);
+ X509_check_purpose(x, -1, 0);
+ if (x->ex_flags & EXFLAG_SS)
+ {
+ x = sk_X509_pop(chain);
+ X509_free(x);
+ }
+ }
+ }
+ /* Check security level of all CA certificates: EE will have been
+ * checked already.
+ */
+ for (i = 0; i < sk_X509_num(chain); i++)
+ {
+ x = sk_X509_value(chain, i);
+ rv = ssl_security_cert(s, ctx, x, 0, 0);
+ if (rv != 1)
+ {
+ SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, rv);
+ sk_X509_pop_free(chain, X509_free);
+ rv = 0;